Machine for preparing cutter disks



NOV. 17, 193.1. A KESSLER MACHINE FOR PREPARING CUTTER DISKS Filed Aug.28, 1929 2 Sheets-Sheet gwue/ntoz ji [arly 4. ms: 192' dbbomwq I Nov.17, 1931. H. A. KESSLER 1,831,869

MACHINE FOR PREPARING CUTTER DISKS Filed Aug. 28, 1929 2 Sheets-Sheet 2'l .1 I W p m .2/ O W 59 52 31 2 Z I, 28 g \1 /5/ Z l um F 5'5 59 54 a3gwue'ntoc Harry 4 JfJSZPI' abhozwaq Patented Nov. 17, 1931 UNITED STATESPATENT OFFICE HARRY A. KESSLER, OF CHICAGO, ILLINOIS, ASSIG-NOR-TO KALMAN STEEL COMPANY,

INC., OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE MACHINE FORPREPARING CUTTER DISKS Application filed August 28, 1929; Serial No.388,921.

In the production of expanded metal lath the blank or sheet from whichthe lath is formed is, in a number of processes, characteristicallyslitted and for this purpose cutter disks are employed which cooperatein pairs to form the slits by a shearing action. Thus it is necessarythat in a side face of one or both of the disks of a cooperating pairthere be formed radial recesses extending for a suitable depth from theperiphery, such recesses, by their lengths and relative centering,determining the lengths of the slits and of the unslitted portionsbetween adjacent a-lining slits. Heretofore these recesses have beenformed by milling cutters,- the utility of which for the purpose inview'has been limited to work upon the disks as annealed butbefore'being hardened.

The present invention relates to an improved machine for preparingcutter disks of the kind described that is to say for forming threcesses in such disks and it contemplates a machine of novelorganization and operation wherein and whereby the formation of therecesses is accomplished rapidly and economically by a grinding wheelwhich may work upon the disksafter' they have been hardened and hence isavailable to form the recesses in new disks and to dress them orentirely re-form them in disks which have been used and whose diametershave been reduced from time to time by repeated dressing or sharpeningof their peripheries.

An embodiment of the invention is illustrated 'in the accompanyingdrawings in which Figure 1 is a side elevation of a machine constructedin accordance with the. invention. Figure 2 is a top plan view of thesame.

Figure 3 is a sectionftaken along line 3-3 ofFig;1. Figure 4 is asection taken along line 44 of Fig. 1.

Figure 5 is a sectional view of the front portion of the carriageshowing the grinder and adjusting means therefor.

Figure 6 is a section taken along line 6-6 ofFig.5.

The machine includes a main frame having a top plate 20 supported upon asuitable tuating cam 42 which in cooperation with the spring 40 controlsthe movements of said bed plate or base 21 by the end members 22. Thetop plate 20 is'provided at one end with a raised track section 23cooperative with a reclprocatory carriage 24.

The track section 23 (Fig. 3) is of dove-- tail or other suitable crosssection and is formed with a longitudinal slot 25 to accommodate therack 26 secured to the bottom of the carriage 24.

A template 27, moun ted for step by step rotary movement, is arrangedabove the top plate at a suitable distance from the track section 23 andsupports the cutterdisk blank C which is to be operated upon. Thetemplate is keyed upon a vertical shaft 28 having its bearings in bosses29 and 30' which may be cast integrally with the upper and lower platesrespectively of the main frame. Also keyed upon the shaft 28 between thebosses 29 and 30, is a ratchet wheel 31 by which an intermittentmovement is imparted to the template 2?. The ratchet wheel 31 is Iengaged by apawl 32 pivotally secured to an loaded pawl 32 is connected.A threaded rod 36' extends from the outer end of the slide 35 throughthe plate or cap 37 which is secured to the end of the lever and carriesadjusting nuts'38 and 39 at the opposite sides of the cap, said nutsproviding for the adjustment and securement of the slide in the obviousmanner. The lever 33 is connected to one end of a suitably mountedspring40 which participates in the operation of the said lever. At itsinner end the lever carries a roller 41 for engagement with an aclever.The cam 42 is mounted upon a vertical shaft 43 and-driven by a motorthrough suitable reduction gearing 45.

The recessing of the slitting cutter is performed by a rotary grindingwheel 46 mounted on the reciprocating carriage 24. Said carriageincludes a base having its cross sec-v -tion formed for guidingengagement with the track section 23.

.from the recess 60 in the template 27.

At its forward end the carriage 24 is provided with a block 47 suitablymounted for vertical adjustment and which is provided With a bearing 48for the shaft 49 which carries the grinding wheel 46. The shaft 49 issuitably driven, for example by belt gearing from a motor 50 on theopposite end of the carriage 24.

The rack bar 26 previously mentioned meshes with a pinion 51 keyed to atransverse shaft 52 which is journaled in a bearing 53 secured to thebase plate of the machine. The pinion 51 is a part ofthe reductiongearing which includesa smaller pinion 54 also keyed on the transverseshaft 52 and a rack 55 with which the pinion 54 meshes.

The rack 55 is carried by a reciprocatory bar '56 having a roller 57 forengagement with a cam 58, the bar being pressed toward said cam'by aspring 591 The cam 58 is mounted upon the shaft 43 below the cam 42.

The template 27 is provided with a series of circumferential recesses60, the spacing of which corresponds to and determines the spacing ofthe recesses which are to be formed in the cutter disk. These recesses60 cooperate with a spring pressed bolt 61 mounted in a casing 62secured to the main frame, the bolt serving to lock the template againstrotation during the grinding operation.

Means is provided for disengaging the bolt 61 from a recess 60 to permitrotation of thetemplate. A bar 63 extending forwardly from the carriage24 is provided on its outer end with a cam surface 64. The bar 63 isslidable through an opening in the casing 62 and bears upon a shoulder65 on the bolt 61, the said bolt being forced to an inoperative positionupon the engagement of its shoulder 65 by the cam surface 64.

In the operation of the machine, the rotation of the cams 42 and 58 isso timed that 'upon the completion of a recess in the cutting disk, thecam 58permits a forward movement of the rack bar 56 underthe influenceof the spring 59 with a resultant rearward movement of the carriage 24to disengage the grinder from the disk upon which it has beenworking.The length of the extension 63 is such that as the carriage approachesits rearmost position, the cam surface 64 will engage the bolt 61. towithdraw the same At this point, the cam 42 actuates the lever 33 tocause a movement of the template through the distancebetween adjacentmarginal recesses. The template thus having been moved the cam 58actuates the bar 56 to force the same rearwardlv which movement throughthe gears 51 and 54 imp-arts a forward movement to the. carriage. Beforethe carriage. reaches the end of the forward -moVement, the cam surface64 on the exten cent recess of the template so that the template isagain latched during the next operation of the grinder. The contour ofthe cam 58 is such that the grinding wheel is given a slow feed radiallyover the cutter disk for a distance sufficient to form a recess of therequired extent.

The template is supported on a collar 28a carried by the shaft 28 and ispreferably held thereon by a clamping plate 28?) secured on athreadedextension of the shaft, the plate 286 also serving to secure the cutterdisk. As thus arranged the template may be re placed as required by onehaving a different arrangement of marginal recesses, such replacementmerely involving removal of the template, from the shaft 28 and thefitting on said shaft of the template required to be substituted. Itwill be apparent that as the periphery of the cutter disk is reduced byrepeated dressing the centers of the radially extending recesses thereinwill be proportionately closer. Ultimately a point 1s reached at whichthe slits formed by the disk will be too short. To meet this conditionand thus prolong the effective life of the cutter disk a new templatehaving a suitable number andarrangement of recesses 60 is substituted.In connection with such substitution the step of rotation of the newtemplate must be adjusted to accord with the arrangement of its recessesand this is accomplished by a suitable adjustment of the pivot of thepawl 32 lengthwise of-the lever 33 by the means above described,together with the substitution of another ratchet wheel 31 having teethcorresponding in number and arrangement to the recesses of thesubstituted template. V

Having fully described my invention, I

claim:

. 1. In a machine for recessing cutter disks, the combination of acarriage, a grinder car- .ried by said carriage, means for rotating saidgrinder, means for supporting a cutter disk in such relation to thegrinder that the grinder, in its operative position, forms a marginalrecess in the adjacent side of the disk, means for reciprocating saidcarriage toward and away from said supporting means, means operativewhen the carriage is moved away from said supporting means for effectinga step of rotation of said support ing means, means operative when thecarriage is moved toward said supporting means for locking saidsupporting means against rotation, and means carried by said carriagefor rendering said locking means inoperative when the carriage movesaway from said supporting means.

2. In a machine for recessingcutter disks, the combination of acarriage, a grinder carried by said carriage means for rotating saidgrinder, means for supporting a cutter disk in such relation to thegrinder that the grinder, in its operative position, forms a marginalrecess in the adjacent side of the disk, means for reciprocating saidcarriage toward and away from said supporting means, means for effectinga step by step rotation of said supporting means, means operative whenthe carriage is moved toward said supporting means for locking saidsupporting means against rotation, a member carried by said carriage andextending in front of the same, the said member having a camming surfaceadaptedto engage said locking means to render the same inoperative whenthe carriage is moved away from said supporting means.

3. In a machine for recessing cutter disks, the combination of acarriage, a grinder carried by said carriage, means on said carriage forrotating said grinder, a removable template for supporting a cutter diskin such relation to the grinder that the grinder, in its operativeposit-ion, forms a marginal recess in the adjacent side of the disk,means for reciprocating said carriage toward and away from saidtemplate, and means operative when the carriage is moved away from saidtemplate for effecting a step of rotation of the template. 7

I. In a machine for recessing cutter disks, the combination of acarriage, a grinder carried by said carriage, means on saidcarriage forrotating said grinder, a removable template for supporting a cutter insuch relation to the grinder that the grinder, in its operativeposition, forms a marginal recess in the adjacent side of the disk,means for reciprocating said carriage toward and away from said templateand means operative when the carriage is moved away from said templatefor effecting a step of rotation of the template, said last mentionedmeans being adjustable to vary the extent of such rotation.

5. In a machine for recessing cutter disks, the combination of acarriage, a grinder carried by said carriage, means for rotating saidgrinder, a removable template for suppor in a cutter disk in suchrelation to the grinder that the grinder, in its operative position,forms a marginal recess in the adjacent side of the disk, means forreciprocating said carriage toward and away from said template, meansoperative when the carriage is moved away from said template foreffecting a step of rotation of the te1nplate,said last mentioned meansbeing adjustable to vary the extent of such rotation and means operativewhen the carriage is movedtoward said template for locking said templateagainst rotation.

6. In a machine for recessing cutter disks,

the combination of a carriage, a grinder car- I ried by said carriage,means for rotating said grinder, means for supporting a cutter disk insuch relation to said grinder that the grinder, in its operativeposition, formsa marginal recess in the adjacent side of the disk, saidsupporting means including a frame and a shaft journaled therein, meansfor removably securing said cutter disk to said shaft, means for,reciprocating said carriage toward and away from said cutter disk, andmeans operative when the carriage is moved away from said cutter disksfor effecting a step of rotation of the said shaft, said last mentionedmeans being adjustable to vary the extent of such rotation.

7. Ina machine for recessing cutter disks, the combination of acarriage, a grinder carried by said carriage, means for rotating saidgrinder, means for supporting a cutter disk in such relation to thegrinder that the grinder, in its operative position, forms a marginalrecess in the adjacent side of the cutter disk, said supporting meansincluding a frame and a shaft, a ratchet wheel fixed to said shaft, alever pivoted adjacent said ratchet wheel and carrying a pawl ontheendthereof which normally engages said ratchet Wheel, meansforreciprocating said carriage toward and away from said'cutter disk,and means for oscillating said lever to effect a step of rotation ofsaid shaft when the carriage is moved way from said cutter disk, saidpawl being adjuslable to vary the extent of such rotation. V

8. Ina machine for recessing cutter disks, the combination of acarriage, a grinder carried by said carriage, meansfor rotating saidgrinder, a shaft having a removable template thereon adapted to supporta cutter disk in such relation to the grinder that the grinder, in itsoperative position, forms a marginal recess in the adjacent side ofthedisk, a rack bar secured to said carriage, means for actuating said rackbar, said means including a second rack bar operatively connected to thefirst said bar, the said second rack bar having a roller mounted on theend thereof, a ratchet wheel fixed to said template shaft, a leverpivoted adjacent said ratchet wheel and carrying a pawl which normallyengages said wheel and carrying a roller on the opposite end thereof, asecond shaft having cams mounted thereon, one of said cams engaging theroller on said lever to effect a step by step rotation of-said template,the other said cam engaging the roller on the end of said second rackbar to effect a reciprocatory movement of the carriage toward and awayfrom said template.

9. In a machine for recessing cutter disks, the combination of acarriage, a grinder carried by said carriage, a rack bar secured to saidcarriage, means for actuating said rack bar, said means including asecond rack bar,

the disk, a shaft to which said support is secured, a ratchet wheelsecured to said shaft, a pawl co-operating with said ratchet wheel, asecond shaft and cams carried by said second shaft, one of said camsbeing adapted to operate said pawl to effect a step-by-step rotarymovement of said support and said second cam co-operating with saidsecond rack bar to move said carriage away from said support during thestep-by-step rotary movements of the latter.

10. In a machine for recessing cutter disks, the combination of acarriage, a grinder carried by said carriage, a rack bar secured to saidcarriage, means for actuating said rack bar, said means including asecond rack bar, a support for a cutter disk adapted to support the saiddisk in such relation to the grinder that the grinder in its operativeposition, forms 'a recess in the adjacent side of the disk, a shaft towhich said support is secured, a ratchet wheel secured to said shaft, apawl co-operating with said ratchet wheel, a second shaft, a cam carriedby said second shaft adapted to operate said pawl to effect astepby-step rotary movement of said support, means for locking saidsupport against movement, a second cam carried by said second shaftco-operating with said second rack bar to move said carriage away fromsaid support and means carried by said carriage for rendering saidlocking means for said support inoperative during the operation of saidpawl. r

11. In a machine for recessing cutter disks, the combination of acarriage, a grinder carried by said carriage, a support for a cutterdisk adapted to support the said disk in such relation to the grinderthat the grinder, in its operative position, forms a recess in theadjacent side, of the disk, a shaft to which said support is secured.means for reciprocating said carriage toward and away from saidsupporting means, a ratchet wheel secured to said shaft, a pawlco-operating with said ratchet wheel, a template carried by said shaft,means for engaging said template to lock said shaft against movement,means for operating said pawl to effect a step of rotation of said shaftand means carried by said carriage for releasing said engaging meansduring the operation of said pawl.

In testimony whereof I aflix my signature.

HARRY A. KESSLER.

